package com.truthbean.jeetb.cms.sys.servlet.kindeditor;

import com.alibaba.fastjson.JSONObject;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Created by TruthBean on 2016-10-09 17:35.
 */
@WebServlet("/plugin/kindeditor/upload.json")
public class FileUploadServlet extends HttpServlet {

    private String getError(String message) {
        JSONObject obj = new JSONObject();
        obj.put("error", 1);
        obj.put("message", message);
        return obj.toJSONString();
    }

    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("application/json;charset=utf-8");
        try {
            /**
             * KindEditor JSP
             * 本JSP程序是演示程序，建议不要直接在实际项目中使用。 如果您确定直接使用本程序，使用之前请仔细确认相关安全设置。
             */

            //文件保存目录路径
            String savePath = request.getServletContext().getRealPath("/") + "resources/";

            String savePath$ = savePath;

            //文件保存目录URL
            String saveUrl = request.getContextPath() + "/resources/";

            //定义允许上传的文件扩展名
            HashMap<String, String> extMap = new HashMap<>();
            extMap.put("image", "gif,jpg,jpeg,png,bmp");
            extMap.put("flash", "swf,flv");
            extMap.put("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
            extMap.put("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");

            //最大文件大小
            long maxSize = 10 * 1024 * 1024 * 1024L;

            response.setContentType("text/html; charset=UTF-8");

            if (!ServletFileUpload.isMultipartContent(request)) {
                response.getWriter().println(getError("请选择文件。"));
                return;
            }
            //检查目录
            File uploadDir = new File(savePath);
            if (!uploadDir.isDirectory()) {
                response.getWriter().println(getError("上传目录不存在。"));
                return;
            }
            //检查目录写权限
            if (!uploadDir.canWrite()) {
                response.getWriter().println(getError("上传目录没有写权限。"));
                return;
            }

            String dirName = request.getParameter("dir");
            if (dirName == null) {
                dirName = "image";
            }
            if (!extMap.containsKey(dirName)) {
                response.getWriter().println(getError("目录名不正确。"));
                return;
            }
            //创建文件夹
            savePath += dirName + "/";
            saveUrl += dirName + "/";
            File saveDirFile = new File(savePath);
            if (!saveDirFile.exists()) {
                saveDirFile.mkdirs();
            }
            SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
            String ymd = sdf.format(new Date());
            savePath += ymd + "/";
            saveUrl += ymd + "/";
            File dirFile = new File(savePath);
            if (!dirFile.exists()) {
                dirFile.mkdirs();
            }

            FileItemFactory factory = new DiskFileItemFactory();
            ServletFileUpload upload = new ServletFileUpload(factory);
            upload.setHeaderEncoding("UTF-8");
            List items = upload.parseRequest(request);
            Iterator itr = items.iterator();
            while (itr.hasNext()) {
                FileItem item = (FileItem) itr.next();
                String fileName = item.getName();
                //long fileSize = item.getSize();
                if (!item.isFormField()) {
                    //检查文件大小
                    if (item.getSize() > maxSize) {
                        response.getWriter().println(getError("上传文件大小超过限制。"));
                        return;
                    }
                    //检查扩展名
                    String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
                    if (!Arrays.<String>asList(extMap.get(dirName).split(",")).contains(fileExt)) {
                        response.getWriter().println(getError("上传文件扩展名是不允许的扩展名。\n只允许" + extMap.get(dirName) + "格式。"));
                        return;
                    }

                    SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
                    String newFileName = df.format(new Date()) + "_" + new Random().nextInt(1000) + "." + fileExt;
                    try {
                        File uploadedFile = new File(savePath, newFileName);
                        item.write(uploadedFile);
                    } catch (Exception e) {
                        response.getWriter().println(getError("上传文件失败。"));
                        return;
                    }

                    JSONObject obj = new JSONObject();
                    obj.put("error", 0);
                    obj.put("url", saveUrl + newFileName);

                    request.getSession().setAttribute("fileName", savePath$ + fileName);
                    request.getSession().setAttribute("filePath", savePath + newFileName);
                    request.getSession().setAttribute("fileUrl", saveUrl + newFileName);

                    response.getWriter().println(obj.toJSONString());
                }
            }
        } catch (FileUploadException ex) {
            Logger.getLogger(FileUploadServlet.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}
